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ICSE Guess > ICSE Papers > Important Questions > Class X > Chemistry > Chemistry By M. P. Keshari

ICSE Chemistry Class X Important Papers By M. P. Keshari

Hydrogen Chloride

Q.1. What property of hydrogen chloride is demonstrated when it is collected by downward delivery[upward displacement].

Ans.:

Hydrogen chloride is 1.28 times heavier than air.

Q.2.Why is hydrogen chloride not collected over water.

Ans.:

Because hydrogen chloride is highly soluble in water.

Q.3. Write the equation for the following reaction :

  1. Dil. HCl and sodium thiosulphate.
  2. Dil. HCl and lead nitrate solution.

Ans.: -

  1. Na2S2O3 + 2HCl → 2NaCl + SO2 + S + H2O
  2. Pb(NO3)2 + 2HCl → PbCl2 ↓ + 2HNO3.

Q.4.

  1. (i) What must be added to sodium chloride to obtain hydrogen chloride. Write the equation for the reaction.
    (ii) Write the equation for the preparation of hydrogen chloride from sodium chloride and sulphuric acid. State whether the sulphuric acid should be concentrated or dilute.

Ans.:

  1. Concentrated sulphuric acid.
    NaCl + H2SO4 (Conc.) → NaHSO4 + HCl ↑
    2NaCl + H2SO4 (Conc.) → Na2SO4+ 2HCl ↑
  2. NaCl + H2SO4 (Conc.) → NaHSO4 + HCl ↑
    2NaCl + H2SO4 (Conc.) → Na2SO4+ 2HCl ↑


Prepared By Mr. M.P. Keshari
Email Id - mpkeshari@yahoo.com
Phone No. - 09434150289

 

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